Elevator for well-casings.



J. F. THOMPSON.

ELEVATOR FOB WELL OASINGS.

APPLICATION FILED 3.21, 1911.

1,003,546, Patented Sept. 19, 1911.

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mjw A54 Ghoul UNITED T OFFICE.

JOSEPH FLANAGAN THOMPSON, OF MARIETTAr-OBIOI ELEVATOR FOR wELn oAsINGs.

To all whom it may concern:

Be it known that I, JOSEPH FLANAGAN THOMPSON, a citizen of the UnitedStates, residing at Marietta, in the county of \Vashington and State ofOhio, have invented certain new and useful Improvements in Elevators forlVell-Casings; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to improvements in elevators for well casings andtubes.

One object of the invention is to provide an elevator of this characterhaving an improved means whereby the same may be readily detached from asection of easing or tubingafter the same has been elevated and removedfrom the well.

Another object is to provide a device of this character which will besimple, strong and durable in construction, efficient and reliable inoperation and well adapted to the purpose for which it is designed.

\Vith these and other objects in view the invention consists of certainnovel features of construction, combination and arrangement of parts as.will be more fully described and particularly pointed out in theappended claims.

In the accompanying drawings: Figure 1 is a side view of a section ofwelltubing showing the invention applied thereto; Fig. 2 is a similar.view showing the manner in which the elevator is disengaged from thesection of well tubing after the same has been elevated and removed fromthe well; Fig. 3 is a perspective view of the elevator :emoved from thetubing; Fig. 4 is a hori- :ontal sectional view of the elevator; Fig. 5s a detail perspective view of the same howing the parts separated.

My improved casing elevator comprises a asing engaging clamp consistingof detachbly connected members 1 and 2. The memer 1 of the clampcomprises a central body ortion having formed in its inner side auni-circular recess 3 and on its opposite lde edges laterally projectingwings 4 Inch are notched on their inner edges to am tapered dove-tailshaped guide recesses and 6 with which are adapted to be slid- )lyengaged tapered dove-tail shaped proctions 7 and 8 formed on the sideedges of .e member 2 of the clamp, said member wing in its inner sidea'semi-circular re Specification of Letters Patent.

Application filed April 21, 1911'.

Patented Sept. 19, 1911 Serial No. 622,622.

cess 9 which coacts with the recess 3 in the member 1 and forms acircular passa e with which. the casing or tubing of the we is engaged.By constructin the recesses 5 and 6 and the projections l and 8 intapered dovetail form it will be seen that when the section 2 is engagedwith the 'section 1 that said sections will .be locked together againstlateral separation and can only be detached by a vertical movement ofthe sections in opposite directions or in other words, in order toseparate the sections of the clamp, it is necessary to raise or to holdthe section 2 against movement and then lower the section 1 whereby thesections will slip apart and are thus readily separated from the easingor tubing. i

In the outer ends of the wings 4 are connected the lower ends ofupwardly extending inwardly curved lifting bails 10 the u per ends oiwhich are adapted to be broug t together and attached to a hoistingcable by means of which the casing or tubing is drawn upwardly from thewell 1 until the lower end of the upper section is exposed whereuponsaid upper section is unscrewed or disengaged from the next section andthus removed from the well. In order'to readily disconnect the sectionsof the clamp after the section or casing has thus been lifted andremoved from the well I rovide the section 2 with a short bail 11 which,before'the casing is drawn up is adapted to be engaged with or hookedover the upper' end of the casing whereupon after the section of thecasing has been lifted and swung laterally the hoisting cable isslackened to a sutiicient extent to permit the lower end of the casingto rest on the ground and the clamp to slide down a short distance onthe upperportion of the casing. The casing in thiis sliding down bringsthe bail 11 on the section 2 into engagement with the upper end of thecasing which will limit or stop the downward movement of the section 2and permit the section 1 to slide down out of engagement with thesection 2 thereby separating said sections whereupon the member 1 of theclamp may be swung out of enga ment with the casing. In order to pull tc all 11 and easing member 2 from the upper end of the casing, said bailis preferab y provided with a short chain 12 and ring 13. The chain 12may be of sufiicient length to permit the ring to be reached or a w record or cable may be attached to said ring and the latter thus pulled todisengagethe bail from the upper end of the casing.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and operation of the invention will bereadily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advan tages of the invention as defined in theappended claims.

I-Iaving thus described my invention what I claim is: i

1. An elevator for well casings comprising a tube engaging clamp formedin longitu inally separable sections, means formin a part of the latterto detachably hold sai sections in operative posit-ion to en age thecasing, lifting bails loosely connecte to said clamp, and means attachedto one member of said clamp whereby said member is held while the othermember is lowered "out of engagement therewith thereby separating saidmembers. I

2. An elevator. for well casings comprising a casing engaging clampconstructed in separable sections one .of said sections having formedtherein tapered dovetail shaped recesses, similarly shaped projectionsformed on the other section and 'adapted to engage said recesses wherebysaid sections are detachably connected together hoisting bails looselyconnected to one o said sections, and means connected to the othersection whereby said sections are adaptedto' be separated longitudinallyto disengage the same from the casing after the same has been lifted andremoved from the well.

3. An elevator for well casings comprismg a casing engaging clampconstructed in separable sections, one of said sections hav ing formedtherein tapered dovetail shaped recesses, similarly shaped projectionsformed on the other section and adapted to engage said recesses wherebysaid sections are detachably connected together, hoisting bails looselyconnected to one of saids'ectmns, a bail secured-to the u per end of theother member, saidbail being adapted to be engaged with the upper end ofthe well casing whereby when the latter is lifted and removed from thewell and the hoisting cable slackened to lower the clamp, said bail willhold one member of the latter, while the other member sli s downwardlyout of engagement -therewltl l thereby separating said members and aflexible connection secured to said bail whereby the same may be pulledout of engagement with the upper end of the well casing.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

' IOSEPH FLLNAGAN THOMPSON. Witnesses:

E'I'I'A J m n,

ANNA MGINTIRE.

